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Cyanotic nephropathy--a morphometric analysis
Prajakta A Gupte1, Pradeep Vaideeswar, Bhuvaneshwari M Kandalkar
1Department of Pathology (Cardiovascular & Thoracic Division), Seth GS Medical College, Mumbai, India.
Insights
Cyanotic congenital heart disease (CCHD) causes significant kidney damage, including enlarged glomeruli and fibrosis. These changes worsen with decreased pulmonary blood flow and are age-dependent, impacting renal function.
Area of Science:
- Nephrology
- Cardiology
- Pathology
Background:
- Cyanotic congenital heart disease (CCHD) is linked to kidney complications.
- Understanding the histopathological changes in the kidneys of CCHD patients is crucial.
Purpose of the Study:
- To objectively analyze the histopathological changes of cyanotic nephropathy at autopsy.
- To compare renal findings in CCHD patients with age-matched controls.
Main Methods:
- Retrospective study of 50 CCHD autopsies and 25 controls.
- Morphometric analysis of Bowman's capsule, glomerular tuft, and hilar arteriole diameters.
- Statistical analysis using unpaired t-test (P≤0.05 significant).
Main Results:
- CCHD kidneys showed glomerulomegaly, glomerulosclerosis, and fibrosis.
- Morphometric parameters were significantly higher in CCHD cases versus controls.
- Changes were more pronounced with decreased pulmonary blood flow and varied significantly by age group.
Conclusions:
- CCHD patients exhibit significant, morphometrically assessed kidney changes.
- These renal alterations contribute to renal dysfunction.
- Kidney changes are influenced by patient age and pulmonary blood flow status.
Objective:
Nephropathy is a known complication in cyanotic congenital heart disease (CCHD). This study was undertaken for an objective analysis of histopathological changes of cyanotic nephropathy at autopsy.
Design:
Retrospective case records studied.
Setting:
Tertiary care teaching hospital affiliated to medical college in Mumbai, India.
Patients And Methods:
The renal histopathological findings of 50 consecutive autopsies in patients with CCHD were compared with 25 age-matched controls. The Bowman's capsular, glomerular tuft, and hilar arteriolar diameters were measured morphometrically. Statistical analysis was performed using unpaired t-test. A P value equal to or less than .05 was considered significant.
Results:
Among the 50 autopsied cases of CCHD, there were 35 males and 15 females, with a mean age of 4.64 years. The renal changes observed were glomerulomegaly, glomerulosclerosis, periglomerular fibrosis, hyperplastic arteriolosclerosis, and interstitial fibrosis. The objectively measured parameters were higher in cases as compared with controls in all age groups, and further these were also found to be higher in patients having decreased pulmonary arterial blood flow than those having normal to increased pulmonary arterial blood flow. The difference in Bowman's capsular and glomerular tuft diameters was statistically significant in the neonates and children in the age groups, 1-5 years and above 10 years. The difference in hilar arteriolar diameter was statistically significant for all age groups except neonates.
Conclusion:
Patients with CCHD show significant changes in the kidneys as assessed morphometrically, leading to renal dysfunction, and the age of the patients plays a role in their development.
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